Hello Everybody. I have a 94 F350 7.3l non turbo idi with 200,000 miles. My glow plugs fire just fine when the engine is cold. But if I am driving around town and let the truck sit for a half hour or so they don't fire again until the engine is completely cold. Anyone have any ideas on what it could be? Thanks.

You'll probably get more answers posting in the IDI section - 7.3L IDI (Non-Powerstroke) Diesels - Ford Powerstroke Diesel Forum ; GP timing on the Powerstrokes is done by the PCM, whereas you have a dedicated glow plug controller. Different generations of IDI have different kinds of glow plug controller, but they're all some form of thermal control.

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